Android开发之将json数据解析后填充到ListView

来源：互联网发布：oracle数据库全库备份编辑：程序博客网时间：2024/06/05 18:37

Android开发之将json数据解析后填充到ListView是大多数移动开发人员会遇到的问题，这里就给记录一下我遇到时我是怎么做的。。

新建一个Test类，代码如下：

public class Test {

   public String getVegetable() {
       return Vegetable;
   }
   public void setVegetable(String vegetable) {
       Vegetable = vegetable;
   }

   public String getNumber() {
       return Number;
   }
   public void setNumber(String number) {
       Number = number;
   }
   private String Vegetable;
   private String Number;

}
再建一个类用来解析和填充数据代码如下：
public class TestActivity extends Activity {
   ListView myListView;
   // ArrayList list ;
   ArrayList<Test> list;
   ProgressBar progressBar;
   AllViewHolder holder;
   Test test;
   MyListViewAdapter adapter;
   private String josnData = "[{\"Vegetable\":\"dfsdsdf\",\"Number\":\"sfsdfsdf\"}," +
           "{\"Vegetable\":\"dfsdsdf\",\"Number\":\"sfsdfsdf\"}," +
           "{\"Vegetable\":\"dsgsdg\",\"Number\":\"sfsdfsdf\"}," +
           "{\"Vegetable\":\"gsgsdg\",\"Number\":\"sfsdfsdf\"}]";

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       progressBar = (ProgressBar)findViewById(R.id.progess);
       // initData();
       refresh();
   }
   public void refresh(){
       try {
           Thread.sleep(5*1000);
       } catch (InterruptedException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       progressBar.setVisibility(View.GONE);
       praseFromJosn(josnData);
       myListView = (ListView) findViewById(R.id.listview);

       adapter = new MyListViewAdapter(TestActivity.this);
       myListView.setAdapter(adapter);
       //给ListView注册一个上下文菜单
       registerForContextMenu(myListView);

   }



   class AllViewHolder {
       TextView Vegetable;
       TextView Number;
   }

   class MyListViewAdapter extends BaseAdapter {
       private Context context;
       LayoutInflater myInflater;

       public MyListViewAdapter(Context context) {
           this.context = context;
           myInflater = LayoutInflater.from(context);
       }

       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           return list.size();
       }

       @Override
       public Object getItem(int position) {
           // TODO Auto-generated method stub
           return list.get(position);
       }

       @Override
       public long getItemId(int position) {
           // TODO Auto-generated method stub
           return position;
       }

       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           test = list.get(position);
           if (convertView == null) {
               convertView = myInflater.inflate(R.layout.activity_vegetable, null);
               holder = new AllViewHolder();

               holder.Number = (TextView) convertView
                       .findViewById(R.id.Number);
               holder.Vegetable = (TextView) convertView.findViewById(R.id.Vegetable);

               convertView.setTag(holder);

           } else {

               holder = (AllViewHolder) convertView.getTag();
           }
           holder.Number.setText(test.getNumber());
           holder.Vegetable.setText(test.getVegetable());
           return convertView;
       }

   }

   public List praseFromJosn(String jsonData) {
       Type ListType = new TypeToken<ArrayList<Test>>() {
       }.getType();
       Gson gson = new Gson();
       list = gson.fromJson(jsonData, ListType);

       return list;

   }
}

当然，xml文件分为两部分，一部分有listview，另一部分是填充到listview的item，代码如下：

main_activity.xml代码如下:

activity_vegetable.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:orientation="horizontal">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:background="#eeeeee" >

        <ImageView
            android:layout_width="70dp"
            android:layout_height="55dp"
            android:layout_marginBottom="5dp"
            android:layout_marginLeft="5dp"
            android:layout_marginTop="5dp"
            android:background="#8bc34a"/>

        <RelativeLayout
            android:layout_width="120dp"
            android:layout_height="55dp"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="5dp">

            <TextView
                android:id="@+id/Vegetable"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="菜名菜名菜名"
                android:textSize="18sp" />

            <TextView
                android:id="@+id/Price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_alignParentLeft="true"
                android:layout_marginLeft="5dp"
                android:text="￥9.5"
                android:textSize="16sp" />

        </RelativeLayout>

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            >
            <TextView
            android:id="@+id/Number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="5dp"
            android:layout_marginRight="10dp"
            android:text="x1"
            android:textSize="16sp" />

        </RelativeLayout>



    </LinearLayout>

</LinearLayout>

当然，解析数据是要导入Gson的jar包，，，，

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